package com.infomancers.tests.enhancers;

import com.infomancers.collections.yield.asm.NewMember;
import com.infomancers.collections.yield.asm.TypeDescriptor;
import com.infomancers.collections.yield.asmbase.YielderInformationContainer;
import com.infomancers.collections.yield.asmtree.InsnEnhancer;
import com.infomancers.collections.yield.asmtree.enhancers.ArrayLoadEnhancer;
import com.infomancers.tests.TestYIC;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.*;
import org.objectweb.asm.util.ASMifierClassVisitor;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Collection;

/**
 * Copyright (c) 2009, Aviad Ben Dov
 * <p/>
 * All rights reserved.
 * <p/>
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * <p/>
 * 1. Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 3. Neither the name of Infomancers, Ltd. nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 * <p/>
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

@RunWith(Parameterized.class)
public class ArrayLoadEnhancerTests extends EnhancerTestsBase {

    @Parameterized.Parameters
    public static Collection<Object[]> parameters() {
        return Arrays.asList(
                new Object[]{Opcodes.IALOAD, "[I"},
                new Object[]{Opcodes.FALOAD, "[F"},
                new Object[]{Opcodes.DALOAD, "[D"},
                new Object[]{Opcodes.LALOAD, "[J"},
                new Object[]{Opcodes.AALOAD, "[Ljava/lang/Object;"},
//                new Object[]{Opcodes.BALOAD, "[B"}, special case for [B, see EnhancersIntegrationTests
                new Object[]{Opcodes.CALOAD, "[C"},
                new Object[]{Opcodes.SALOAD, "[S"}
        );
    }

    private final int opcode;
    private final String desc;

    public ArrayLoadEnhancerTests(int opcode, String desc) {
        this.opcode = opcode;
        this.desc = desc;
    }

    @Test
    public void arrayLoad_fromConst() {
        YielderInformationContainer info = new TestYIC(1);

        final InsnNode insn = new InsnNode(opcode);
        InsnList original = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new InsnNode(Opcodes.ICONST_0),
                insn);

        InsnList expected = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new InsnNode(Opcodes.ICONST_0),
                new InsnNode(opcode)
        );

        InsnEnhancer enhancer = new ArrayLoadEnhancer();

        enhancer.enhance(owner, original, null, info, insn);

        compareLists(expected, original);
    }

    @Test
    public void arrayLoad_fromField() {
        YielderInformationContainer info = new TestYIC(1,
                new NewMember(1, TypeDescriptor.Integer));

        final InsnNode insn = new InsnNode(opcode);
        final NewMember slot = info.getSlot(1);
        InsnList original = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot.getName(), slot.getDesc()),
                insn);

        InsnList expected = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot.getName(), slot.getDesc()),
                new InsnNode(opcode)
        );

        InsnEnhancer enhancer = new ArrayLoadEnhancer();

        enhancer.enhance(owner, original, null, info, insn);

        compareLists(expected, original);
    }

    @Test
    public void twoConsecutiveArrayLoads_fromConst() {
        YielderInformationContainer info = new TestYIC(1);

        final InsnNode load1 = new InsnNode(opcode);
        final InsnNode load2 = new InsnNode(opcode);
        InsnList actual = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new InsnNode(Opcodes.ICONST_0),
                load1,
                new VarInsnNode(Opcodes.ALOAD, 2),
                new InsnNode(Opcodes.ICONST_0),
                load2);

        InsnList expected = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new InsnNode(Opcodes.ICONST_0),
                new InsnNode(opcode),
                new VarInsnNode(Opcodes.ALOAD, 2),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new InsnNode(Opcodes.ICONST_0),
                new InsnNode(opcode)
        );

        InsnEnhancer enhancer = new ArrayLoadEnhancer();

        enhancer.enhance(owner, actual, null, info, load1);
        enhancer.enhance(owner, actual, null, info, load2);

        compareLists(expected, actual);
    }

    @Test
    public void twoConsecutiveArrayLoads_fromField() {
        YielderInformationContainer info = new TestYIC(1, new NewMember(1, TypeDescriptor.Integer),
                new NewMember(2, TypeDescriptor.Integer));

        final InsnNode load1 = new InsnNode(opcode);
        final InsnNode load2 = new InsnNode(opcode);

        final NewMember slot1 = info.getSlot(1);
        final NewMember slot2 = info.getSlot(2);

        InsnList actual = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot1.getName(), slot1.getDesc()),
                load1,
                new VarInsnNode(Opcodes.ALOAD, 2),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot2.getName(), slot2.getDesc()),
                load2);

        InsnList expected = createList(
                new VarInsnNode(Opcodes.ALOAD, 1),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot1.getName(), slot1.getDesc()),
                new InsnNode(opcode),
                new VarInsnNode(Opcodes.ALOAD, 2),
                new TypeInsnNode(Opcodes.CHECKCAST, desc),
                new VarInsnNode(Opcodes.ALOAD, 0),
                new FieldInsnNode(Opcodes.GETFIELD, owner.name, slot2.getName(), slot2.getDesc()),
                new InsnNode(opcode)
        );

        InsnEnhancer enhancer = new ArrayLoadEnhancer();

        enhancer.enhance(owner, actual, null, info, load1);
        enhancer.enhance(owner, actual, null, info, load2);

        compareLists(expected, actual);
    }

    public static void main(String[] args) throws IOException {
        Object c = new Object() {
            Object a = new int[]{22};

            void method() {
                ((int[]) a)[0]++;
            }
        };

        ASMifierClassVisitor visit = new ASMifierClassVisitor(new PrintWriter(System.out));
        ClassReader reader = new ClassReader(c.getClass().getName());

        reader.accept(visit, 0);
    }
}
